S&S Cycle Rocker Arms and Shaft Set for 1936-1947 Harley-Davidson Big Twin

S&S Cycle Rocker Arms and Shaft Set for 1936-1947 Harley-Davidson Big Twin

Bringing a Knucklehead-era Big Twin valvetrain back to original function requires matched components that work together correctly. This complete set restores proper valve timing and oil control, keeping your classic OHV engine running cleanly and reliably. All four rocker arms and shafts are designed as a matched system, eliminating the guesswork of sourcing valvetrain parts individually.

Key Features

• Complete matched set of four CNC-machined rocker arms and four shafts for a full valvetrain installation
• 1:1 stock rocker arm ratio preserves original valve geometry for authentic Knucklehead performance
• Improved oil control over stock components for extended valvetrain service life
• Compatible with S&S or stock tins – no additional hardware changes required
• Made in the USA; kit includes washers and spacers for a complete installation

Technical Specifications

• Application: 1936-1947 Harley-Davidson Big Twin OHV (Knucklehead)
• Contents: 4 rocker arms, 4 rocker shafts, washers, spacers
• Rocker ratio: 1:1 stock Knucklehead
• Origin: Made in USA

Fitment Notes

• Fits 1936-1947 Harley-Davidson Big Twin OHV (Knucklehead) engines only
• Not compatible with stock rocker shafts – all rocker arms must be used with the included matched shafts
• All four rocker arms and shafts in this kit are unique – do not mix with other rocker components
• Compatible with S&S or stock tins
• Review the Fitment tab for complete year and model compatibility